javax.swing
Interface UIDefaults.LazyValue
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- All Known Implementing Classes:
- UIDefaults.LazyInputMap, UIDefaults.ProxyLazyValue
- Enclosing class:
- UIDefaults
public static interface UIDefaults.LazyValueThis class enables one to store an entry in the defaults table that isn't constructed until the first time it's looked up with one of thegetXXX(key)methods. Lazy values are useful for defaults that are expensive to construct or are seldom retrieved. The first time aLazyValueis retrieved its "real value" is computed by callingLazyValue.createValue()and the real value is used to replace theLazyValuein theUIDefaultstable. Subsequent lookups for the same key return the real value. Here's an example of aLazyValuethat constructs aBorder:Object borderLazyValue = new UIDefaults.LazyValue() { public Object createValue(UIDefaults table) { return new BorderFactory.createLoweredBevelBorder(); } }; uiDefaultsTable.put("MyBorder", borderLazyValue);- See Also:
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UIDefaults.get(java.lang.Object)
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description ObjectcreateValue(UIDefaults table)Creates the actual value retrieved from theUIDefaultstable.
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Method Detail
createValue
Object createValue(UIDefaults table)
Creates the actual value retrieved from theUIDefaultstable. When an object that implements this interface is retrieved from the table, this method is used to create the real value, which is then stored in the table and returned to the calling method.- Parameters:
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table- aUIDefaultstable - Returns:
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the created
Object
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